TY  - JOUR
T1  - Serum Retinol and β-carotene Values in Japanese Black Calves in
Kagoshima Prefecure, Japan
AU - Otomaru, Konosuke 
JO  - Journal of Animal and Veterinary Advances
VL  - 17
IS  - 1
SP  - 29
EP  - 31
PY  - 2018
DA  - 2001/08/19
SN  - 1680-5593
DO  - javaa.2018.29.31
UR  - https://makhillpublications.co/view-article.php?doi=javaa.2018.29.31
KW  - Growing stage
KW  -Japanese black calf
KW  -serum B-carotene
KW  -serum retinol
KW  -values
KW  -growing stage
AB  - To obtain basic data of serum retinol and β-carotene in Japanese black calves in Kagoshima
Prefecture, Japan, blood samples were obtained from 633 clinically healthy calves on 29 farms and 13 cases with
symptoms of respiratory disease calves. Calves were divided into 6 stages: the early suckling stage (between
10 and 45 days of age, n = 103), late suckling stage (between 46 and 90 days of age, n = 115), the first growing
stage (between 91 and 135 days of age, n = 105), the second growing stage (between 136 and 180 days of age,
n = 113), the third growing stage (between 181 and 225 days of age, n = 96) and the fourth growing stage
(between 226 and 270 days of age, n = 101). The mean serum concentrations of retinol were above 15 μg/dL in
the late suckling stage and in all growing stages. On the other hand, the mean concentrations of retinol in early
suckling stage and concentrations of retinol in all cases with respiratory disease were below 15 μg/dL. The mean
serum concentrations of β-carotene in all stages were between 50 and 85 μg/dL and concentrations of
β-carotene in all cases were between 15 and 144 μg/dL (average 54.4). These results suggest that the blood
parameters obtained in this study are considered useful as one of data to clarify reference values of Japanese
black calves.
ER  -